To activate Facebook Messenger for your business page.

• Visit your Facebook business page
• Click on the “Settings” tab
• Navigate to “General” and look for “Messages” in the list
• Click the “Edit” link and tick the box to allow people to contact your page by showing the Message button

Thats it, you are now able to use the simplified links for messenger to link directly to your Facebook business messenger.

Example: http://m/me/yourpagename